Milling heads - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 06-26-2005, 02:19 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default Milling heads

I may be getting a set of L36 heads, and I'd like to know how much they can be milled before piston/valve contact is an issue. Can it be done or do I need to pick up some pistons that are either dished or have valve reliefs?
big_news_1 is offline   Reply With Quote
Old 06-26-2005, 02:28 PM   #2
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

For safety I don't think that I would go past .010 with stock pistons. Probably should have a machine shop look into that one for you.
LakevilleSSEi is offline   Reply With Quote
Old 06-26-2005, 02:29 PM   #3
Senior Member
True Car Nut
 
Join Date: Jun 2003
Location: Purgatory
Posts: 6,313
Thanks: 0
Thanked 0 Times in 0 Posts
PontiacDad is on a distinguished road
Default

You want to make them flat or up your compression? You could use thinner head gaskets if your heads are already true, save a few bucks? 10 thou is not unheard of btw.
PontiacDad is offline   Reply With Quote
Old 06-26-2005, 02:33 PM   #4
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Quote:
Originally Posted by PontiacDad
10 thou is not unheard of btw.
I figured that wasn't unheard of......Just I haven't heard it done on L36'*. Nor am I too familiar with their clearances.

I'd imagine that he'* milling the heads to up the compression. But chances are the engine that he'* getting the heads off of has been overheated pretty good....so he may need some milling just to flatten them out.
LakevilleSSEi is offline   Reply With Quote
Old 06-26-2005, 02:55 PM   #5
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

You're right on both counts, Nate. The heads may be warped, but even if they're not I'd like to get 'em milled for more compression. Is this a question better suited for Todd or Scott?
big_news_1 is offline   Reply With Quote
Old 06-26-2005, 03:00 PM   #6
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

I'd figure that Todd would know for sure. I'd say 20 thou before you need different pistons.
LakevilleSSEi is offline   Reply With Quote
Old 06-26-2005, 03:12 PM   #7
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Check this out:
http://www.zzperformance.com/latest_news1.php?id=48
I'm guessing you can probably mill the heads 40 over with stock thickness head gaskets but i know you can mill 30 over with .052" headgaskets.(someone on clubgp is running it now) You will need 7.0" pushrods to keep correct valvetrain geometry.
95naSTA is offline   Reply With Quote
Old 06-26-2005, 03:17 PM   #8
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

Just be careful if you start messing with rockers and cams. You could run into the valve smacking the piston then


-justin
opensourceguy is offline   Reply With Quote
Old 06-26-2005, 03:20 PM   #9
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Quote:
Originally Posted by opensourceguy
Just be careful if you start messing with rockers and cams. You could run into the valve smacking the piston then


-justin
Which is where the 7.0" push rods come in.
LakevilleSSEi is offline   Reply With Quote
Old 06-26-2005, 03:44 PM   #10
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

for the stock valvetrain.

Not aftermarket.


-justin
opensourceguy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Milling Heads Black Pearl Performance, Brainstorming & Tuning 6 11-15-2010 04:19 PM
are 3.8 L. heads interchangable with 4.3 L. heads? Hay Bay Woody General GM Chat 1 06-21-2010 06:32 PM
Leaking door heads up Mario Rosso 2000-2005 9 05-13-2003 08:22 PM
L67 heads on a L36? 95naSTA Performance, Brainstorming & Tuning 12 05-10-2003 01:35 AM
Heads up display Littlehovey General GM Chat 3 02-21-2003 12:20 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:20 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.